Siemens SITRANS L Pointek ULS200 - Dual Pump Control Example

Pointek ULS200
30 Operating Instructions, 01/2019, A5E32268616-AB
6.5 Dual pump control
This application uses the device to provide a control output when the process material rises
to a high level.
Typically, wet wells are used to temporarily hold storm and/or waste water. When the water
surface reaches a high level setpoint, the wet well is pumped down. The process material
will be pumped down by the deadband value to another setpoint where the control will turn
off.
Relay function 13: dual pump down
①
4 m
②
Relay 1 (e.g. 1 m)
③
Relay 2 (e.g. 0.75 m)
④
Blanking (e.g. 0.5 m)
⑤
Pump 2 start
⑥
Pump 1 start
⑦
Both pumps stop
⑧
Deadband 2 (e.g. 3.25 m)
⑨
Deadband 1 (e.g. 3 m)
Application adjustments
Relay function
• 6 - high control/low alarm
• 7 - high control/high alarm
• 10 - high control/LOE alarm
• 13 - high control/high control
Relay setpoints
Set to desired values.
Deadband values
Referenced from relay setpoints (distance from
Pump Start setpoint to Pump Stop setpoint).